A127183 Number of distinct irreducible characteristic polynomials of n X n real robust {0,1}-matrices.

1, 1, 6, 88, 3719

Offset: 1

Author

Artur Jasinski and Peter Pein (petsie(AT)dordos.net), Jan 07 2007

Keywords

• nonn

Examples

			a(3)=6 because there are 6 different irreducible characteristic polynomials of 3 x 3 binary robust matrices: -1-2y-y^2+y^3,-1-2y-y^2+y^3, -1-y-y^2+y^3, -1+y-2y^2+y^3, -1+2y-3y^2+y^3, 1-y-2y^2+y^3.
		

Crossrefs

Cf. A125587, A125593, A127182, A127184, A127186.

Formula

a(n) = A127182(n) - A127184(n).